Leadership in separations technology for the life sciences		 Whatman
Search 
Home Contact information Request catalogue Legal policy Site Map Find a Rep
Overview
Quantitative Filter Papers - Hardened Ashless Grades
Home | Filter Papers | Cellulose Filters | Quantitative Filter Papers - Hardened Ashless Grades

These are the supreme quantitative filter papers featuring high wet strength and chemical resistance. These papers are acid hardened, which reduces ash to an extremely low level. Their tough surfaces make them suitable for a wide range of critical analytical filtration operations. Each grade offers a convenient combination of filtration speed and particle retention.

Grade 540: 8 µm
The general purpose hardened ashless filter paper with medium retention and flow rate. Extremely pure and strong with a hard surface. High chemical resistance to strong acid and alkali. Frequently used in the gravimetric analysis of metals in acid/alkali solutions and in collecting hydroxides after precipitation by strong alkalis.

Grade 541: 22 µm
Fast filtration of coarse particles and gelatinous precipitates in acid/alkali solutions during gravimetric analysis. Typical applications include fiber in animal foodstuffs, gelatine in milk and cream, chloride in cement, and chloride and phosphorous in coal and coke.

Grade 542: 2.7 µm
High retention of fine particles under demanding conditions. Slow flow rate. Very hard and strong with excellent chemical resistance. Often used in gravimetric metal determinations.


Typical Properties - Quantitative Hardened Ashless Grades
Grade Description Particle
Retention
in Liquid (µm)		 Filtration
Speed
Herzberg (s)		 Ash
Content+
(%)		 Typical
Thickness
(µm)		 Basis Weight
(g/m2)
540 Medium 8*  200 < 0.006 160 88
541 Fast 22* 34 < 0.006 155 82
542 Slow 2.7* 2510 < 0.006 150 93

+ Ash is determined by ignition of the cellulose filter at 900 °C in air
* Particle Retention Rating at 98% efficiency
Ordering Information - Quantitative Filter Papers - Hardened Ashless Grades
Catalog Number Description

Grade 540
1540-321 Grade 540 Circles, 21 mm 100/pk
1540-324 Grade 540 Circles, 24 mm 100/pk
1540-042 Grade 540 Circles, 42.5 mm 100/pk
1540-055 Grade 540 Circles, 55 mm 100/pk
1540-070 Grade 540 Circles, 70 mm 100/pk
1540-090 Grade 540 Circles, 90 mm 100/pk
1540-110 Grade 540 Circles, 110 mm 100/pk
1540-125 Grade 540 Circles, 125 mm 100/pk
1540-150 Grade 540 Circles, 150 mm 100/pk
1540-185 Grade 540 Circles, 185 mm 100/pk
1540-240 Grade 540 Circles, 240 mm 100/pk
1540-270 Grade 540 Circles, 270 mm 100/pk
1540-320 Grade 540 Circles, 320 mm 100/pk

Grade 541
1541-042 Grade 541 Circles, 42.5 mm 100/pk
1541-047 Grade 541 Circles, 47 mm 100/pk
1541-055 Grade 541 Circles, 55 mm 100/pk
1541-070 Grade 541 Circles, 70 mm 100/pk
1541-085 Grade 541 Circles, 85 mm 100/pk
1541-090 Grade 541 Circles, 90 mm 100/pk
1541-110 Grade 541 Circles, 110 mm 100/pk
1541-125 Grade 541 Circles, 125 mm 100/pk
1541-150 Grade 541 Circles, 150 mm 100/pk
1541-185 Grade 541 Circles, 185 mm 100/pk
1541-240 Grade 541 Circles, 240 mm 100/pk
1541-270 Grade 541 Circles, 270 mm 100/pk
1541-320 Grade 541 Circles, 320 mm 100/pk
1541-400 Grade 541 Circles, 400 mm 100/pk
1541-917 Grade 541 Sheets, 460 x 570 mm 100/pk

Grade 542
1542-055 Grade 542 Circles, 55 mm 100/pk
1542-070 Grade 542 Circles, 70 mm 100/pk
1542-090 Grade 542 Circles, 90 mm 100/pk
1542-110 Grade 542 Circles, 110 mm 100/pk
1542-125 Grade 542 Circles, 125 mm 100/pk
1542-150 Grade 542 Circles, 150 mm 100/pk
1542-185 Grade 542 Circles, 185 mm 100/pk
1542-240 Grade 542 Circles, 240 mm 100/pk
1542-400 Grade 542 Circles, 400 mm 100/pk

Support Documentation
Ordering Information
Contact Us
Printable Version
© 2007 Whatman plc.